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(1/7)*x+2/3 = (5/7)*x-(106/21) // - (5/7)*x-(106/21)
(1/7)*x-((5/7)*x)+2/3+106/21 = 0
(1/7)*x+(-5/7)*x+2/3+106/21 = 0
40/7-4/7*x = 0 // - 40/7
-4/7*x = -40/7 // : -4/7
x = -40/7/(-4/7)
x = 10
x = 10
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